Processing Machinery
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PVC Back Pressure and Screw Speed
Fenómeno del problema
After increasing back pressure, plasticization improved but product discoloration intensified and metering time also lengthened
Análisis de la causa
PVC back pressure of 3-10MPa is sufficient; too high causes shear heat accumulation and degradation; screw speed 20-60rpm, high-speed friction heat also exceeds the limit; plasticization relies on temperature rather than shear
Solución
①Back pressure 5-10MPa for rigid, 3-8MPa for soft; ②screw speed 20-60rpm; ③for insufficient plasticization, prioritize fine-tuning temperature rather than back pressure
Conclusión clave
PVC plasticization management takes low shear as the guideline; both back pressure and speed are low, and temperature is the main adjustment means; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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